AFAIK
They are only a few hundred K, and they are pretty darned portable.
Plus you can rip everything out but the locking subsystem if you want (which is implemented using shared memory regions - you could just peek then write it yourself).
Cheers,
Ben
"... I couldn't see how anyone could be educated by this self-propagating system in which people pass exams, teach others to pass exams, but nobody knows anything."
--Richard Feynman